Valve actuator differential worm planetary gear drive

Details Valve actuator differential worm planetary gear drive Valve actuator differential worm planetary gear drive

1988-03-24

1990-01-30

Herrmann, Allan D.

Machine element or mechanism

Alternate manual or power operators

25112903, F16H 3706, F16H 3105

Patent

active

048965626

ABSTRACT:
A valve actuator differential worm planetary gear drive provides forward or reverse motion to a valve stem, from an input from either a motor-driven worm or a handwheel driven worm, by using a plurality of planet gears to send motion to the sun gear. If the preference is to have the motor driven the valve primarily, the manual worm stays locked and the motor worm acts as a planetary arm. When it is desired to move the valve by hand, the motor gear is fixed and rotation of the handwheel worm gear transmits the power through the ring gear and the planet gears to the drive sleeve.

REFERENCES:
patent: 2955486 (1960-10-01), Bacchi
patent: 4261224 (1979-07-01), Sulzer
patent: 4523286 (1985-08-01), Koga et al.

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